Bathrooms hide their cost behind the walls. The visible choices — tile, taps, vanity — are rarely what separates a comfortable project from an expensive one. What separates them is whether the fixtures move and what the last forty years of moisture did to the framing.
A cosmetic refresh keeps every fixture where it is and replaces vanity, toilet, lighting and surfaces. A mid-range remodel converts a tub to a shower or retiles the wet walls within the existing footprint. A full remodel moves fixtures, which means opening the floor, rerouting drains, and bringing everything you touch up to current code. Each tier roughly doubles the one before, and the step from mid-range to full is where budgets break.
Long wet seasons and bathrooms built before anyone thought hard about ventilation produce a consistent pattern statewide: mould behind tile, soft drywall at the tub surround, and extractor fans that vent into the attic instead of outdoors. Proper waterproofing behind wet walls and a fan ducted to the exterior are not upgrades — they are what stops you paying for the same remodel again in eight years.
Curbless showers, blocking in the walls for future grab bars, and a comfort-height toilet cost very little when the wall is already open and a great deal as a retrofit. Even if nobody in the house needs them today, blocking behind the tile is close to free at the framing stage. It is the single most commonly regretted omission we hear about.
Homeowners consistently assume a compact bathroom is a cheap bathroom, and the maths does not work that way. Every bathroom needs the same fixtures, the same waterproofing, the same ventilation and the same inspections regardless of floor area — those costs barely move. What a small room removes is tile quantity, which is one of the cheaper components. It also adds labour, because working in a two-metre space is slower than working in a large one. Expect the per-square-foot number to look alarming and the total to be reasonable.
Three things, in rough order of frequency. Fixture lead times, where a vanity or a specific tile is quoted at two weeks and arrives at nine. Inspection scheduling, where the rough-in inspection sets when tiling can start and the calendar does not care about your plans. And change orders following a discovery — rot under the floor, a drain that is not where the drawing said. A contractor who builds all three into the schedule will quote a longer timeline than one who does not, and will be closer to the truth.
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Replacing a vanity or toilet in place generally does not need a permit. Moving a drain, altering the layout, or changing wiring does — and once you are permitted, inspection scheduling sets the pace of the middle of the job. Confirm current requirements with your local building department for your address.
In pre-1970 housing, opening a bathroom wall commonly reveals galvanised supply lines well past their life and cast-iron drains that are fine until they are not. Neither is an emergency on its own. Both are dramatically cheaper to replace while the wall is already open than as a separate job two years later.
A toilet flange that has been weeping slowly for years is the most common concealed condition in a bathroom remodel, and it is invisible until the floor comes up. It is also why an allowance for concealed damage belongs in the contract rather than in a conversation halfway through.
Cost is driven first by whether fixtures move, second by the condition of the subfloor and supply lines, and only third by the finishes people spend their evenings choosing. A powder room with no wet walls is a fundamentally different project from a primary bathroom with a tiled shower, even at identical square footage. Ask each bid to state whether waterproofing membrane is included, whether the extractor fan is being replaced and vented outdoors, and what the allowance is for rot found under the floor. Hold ten to twenty per cent back for concealed conditions in anything built before 1980.
A cosmetic refresh is often under two weeks. A full remodel that moves plumbing more commonly runs four to six, and single-bathroom households should plan for that honestly rather than optimistically. Tile and waterproofing both have cure times that cannot be compressed.
Usually, for daily use — and it is the most requested change we see. The consideration worth weighing is resale: a house with no bathtub at all can narrow the buyer pool with families. If it is your only tub, think about it twice.
Retiling in place is generally cosmetic. Once you move the drain, alter the framing, or change plumbing, it is not. The line is the plumbing, not the tile — and your contractor should be the one pulling the permit.
Nothing at any point. Describing the project is free, quotes are free, and there is no fee if you go ahead. You pay your contractor for the work, and nothing else.
Contractor-supplied is usually smoother: they get trade pricing, they handle returns when something arrives damaged, and warranty responsibility stays in one place. Buying your own makes sense for a specific item you have set your heart on. What causes trouble is a mix where nobody is clear who owns the delay when a homeowner-supplied vanity turns up wrong.
It is a membrane applied behind tile in wet areas before tiling starts, and it is the difference between a shower that lasts twenty years and one that rots the wall behind it. It is invisible once finished, which is exactly why it gets omitted from cheaper bids. Ask every quote to state explicitly whether it is included and which system is being used.
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